This summary presents findings from an operations research study to assess the outcomes of the Antiretroviral Community Education and Referral (ACER) Project in two urban areas in Zambia—Lusaka and Ndola. The ACER project was implemented by the International HIV/AIDS Alliance, based in England, and the Alliance’s Zambia office, in conjunction with local Zambian partners. Launched in mid-2004, the two-year project built on previous formative research with urban and rural communities that examined knowledge and attitudes about prevention and treatment.